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cpuset: remove unneeded NODEMASK_ALLOC() in cpuset_attach()
oldcs->mems_allowed is not modified during cpuset_attach(), so we don't have to copy it to a buffer allocated by NODEMASK_ALLOC(). Just pass it to cpuset_migrate_mm(). Signed-off-by: Li Zefan <lizf@cn.fujitsu.com> Cc: Paul Menage <menage@google.com> Acked-by: David Rientjes <rientjes@google.com> Cc: Miao Xie <miaox@cn.fujitsu.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -1438,10 +1438,9 @@ static void cpuset_attach(struct cgroup_subsys *ss, struct cgroup *cont,
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struct mm_struct *mm;
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struct cpuset *cs = cgroup_cs(cont);
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struct cpuset *oldcs = cgroup_cs(oldcont);
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NODEMASK_ALLOC(nodemask_t, from, GFP_KERNEL);
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NODEMASK_ALLOC(nodemask_t, to, GFP_KERNEL);
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if (from == NULL || to == NULL)
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if (to == NULL)
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goto alloc_fail;
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if (cs == &top_cpuset) {
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@ -1463,18 +1462,16 @@ static void cpuset_attach(struct cgroup_subsys *ss, struct cgroup *cont,
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}
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/* change mm; only needs to be done once even if threadgroup */
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*from = oldcs->mems_allowed;
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*to = cs->mems_allowed;
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mm = get_task_mm(tsk);
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if (mm) {
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mpol_rebind_mm(mm, to);
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if (is_memory_migrate(cs))
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cpuset_migrate_mm(mm, from, to);
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cpuset_migrate_mm(mm, &oldcs->mems_allowed, to);
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mmput(mm);
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}
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alloc_fail:
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NODEMASK_FREE(from);
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NODEMASK_FREE(to);
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}
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